Multiple choice If fertilisation does not occur, the process of shedding of the uterine wall is called menarche menstruation implantation pregnancy menopause Reveal answer Fill a bubble to check yourself B Correct answer Explanation If fertilisation does not occur, the released egg and the thickened lining of the uterus along with its blood vessels are shed off. This causes bleeding in women which is called menstruation. Menstruation occurs once in about 28 to 30 days.